The catalytic effect of 15 metallic compounds on the transesterification reaction be-tween bisphenol-A and diphenyl carbonate has been investigated，among which <>COONa，LiH，LiAc

CoAc2 and CdAc2 were found to be most active．The rate of transesterification was followed by the amount of phenol Iiberated in a definite interval of time． Experimental data showed that the reaction iS of first order with respect to bisphenol and catalyst(LiAc)but independent of the concentration of diphenyl carbonate． Activation energy were found to be 18 kcal／mole．The rate of poIycondensation with similar catalyst was determined by vaccum re-moval of diphenyl carbonate at 280℃ and estimation of the degree of polymerization by viscosity determination at 20℃． Based on the data obtained a conclusion was drawn that the polycondensation iS also a first order reaction．